JavaScript计算字符串中每个字符出现的次数
JavaScript计算字符串中每个字符出现的次数代码如下:function numInstring(str){ str=str.replace(/ /ig,""); var strArr=str.split(""); var result=[],beforeLength,afterLength,reg; for(var i=0;i<strArr.length;i++){ if(str.indexOf(strArr)!=-1){ beforeLength=str.length; reg=new RegExp(strArr,"ig"); str=str.replace(reg,""); afterLength=str.length; result.push(strArr+":"+(beforeLength-afterLength)); } } return result;}var result=numInstring("This section of the site is dedicated to the JavaScript language itself, the parts that are not specific to Web pages or other host");console.log(result);/*result:["T:17", "h:7", "i:9", "s:10", "e:14", "c:5", "o:8", "n:3", "f:3", "d:3", "a:9", "J:1", "v:1", "r:5", "p:4", "l:2", "g:3", "u:1", ",:1", "W:1", "b:1"]*/
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